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These variables in the static and final class drawable within the class R are references to files of the same name in the folder res/drawable of your project. Make sure you have no file named 123 in this folder, as the reference will fail since in Java you cannot have a variable name that starts with a number.

I don’t understand java, but the variable name is
123? is possible ? already tried for a letter at the beginning to see if the error persists ?– William Novak
I can’t change the R.java
– Harry